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Excitonic Dark States Shed Light on TMDC Atomic Layers

Berkeley Lab researchers have found evidence for excitonic dark states in monolayers of tungsten disulfide that could explain the unusual optoelectronic properties of single atomic layers of transition metal dichalcogenide (TMDC) materials.

Berkeley Lab researchers believe they have uncovered the secret behind the unusual optoelectronic properties of single atomic layers of TMDC materials, the two-dimensional semiconductors that hold great promise for nanoelectronic and photonic applications.

Advanced Light Source Sets Microscopy Record

Ptychographic image using soft X-rays of lithium iron phosphate nanocrystal after partial dilithiation. The delithiated region is shown in red.

Working at Berkeley Lab’s Advanced Light Source (ALS), researchers used “soft” X-rays to image structures only five nanometers in size. This resolution is the highest ever achieved with X-ray microscopy.

A Metallic Alloy That is Tough and Ductile at Cryogenic Temperatures

Rob Ritchie alloys Thumb

A multi-element high‐entropy alloy not only tests out as one of the toughest materials on record, but, unlike most materials, the toughness as well as the strength and ductility of this alloy actually improves at cryogenic temperatures.

Peptoid Nanosheets at the Oil/Water Interface

Peptoid nanosheets are among the largest and thinnest free-floating organic crystals ever made, with an area-to-thickness equivalent of a plastic sheet covering a football field. Peptoid nanosheets can be engineered to carry out a wide variety of  functions.

Researchers at Berkeley Lab’s Molecular Foundry have developed peptoid nanosheets that form at the interface between oil and water, opening the door to increased structural complexity and chemical functionality for a broad range of applications.

Going to Extremes for Enzymes

Extremophiles thriving in thermal springs where the water temperature can be close to boiling can be a rich source of enzymes for the deconstruction of lignocellulose.

In the search for enzymes that can break lignocellulose down into biofuel sugars under the extreme conditions of a refinery, chemist Douglas Clark prospects for extremophilic microbes and engineers cellulases of his own.

Cool Roofs in China Can Save Energy and Reduce Emissions

China climate zone map

Working with Chinese researchers, Berkeley Lab has conducted the first comprehensive study of cool roofs in China and concluded that they would be effective in substantially reducing energy use and greenhouse gas emissions in climate zones with hot summers.

Competition for Graphene

Illustration of a MoS2/WS2  heterostructure with a MoS2 monolayer lying on top of a WS2 monolayer. Electrons and holes created by light are shown to separate into different layers. (Image courtesy of Feng Wang group)

Berkeley Lab reports the first experimental observation of ultrafast charge transfer in photo-excited MX2 materials, the graphene-like two-dimensional semiconductors. Charge transfer time clocked in at under 50 femtoseconds, comparable to the fastest times recorded for organic photovoltaics.

Air Quality in San Joaquin Valley Improving: Study Shows Controls to Reduce Nitrogen Oxide Emissions Are Working

Bakersfield pollution thumb

A study led by Berkeley Lab’s Ronald Cohen has shown that nitrogen oxide emission controls are improving the notorious air quality in California’s San Joaquin Valley.

Bionic Liquids from Lignin

Blake Simmon Ionic_Liquid thumb

Bionic liquids – solvents made from lignin and hemicellulose, two by-products of biofuel production – show great promise for liberating fermentable sugars from lignocellulose and improving the economics of biofuels refineries.

How Sweet It Is: New Tool for Characterizing Plant Sugar Transporters Developed at Joint BioEnergy Institute

A family of six nucleotide sugar transporters never before  described have been characterized in Arabidopsis, a model plant for research in advanced biofuels. (Photo by Roy Kaltschmidt)

JBEI researchers have developed a powerful new tool that can help advance the genetic engineering of “fuel” crops for clean, green and renewable bioenergy – an assay that enables scientists to identify and characterize the function of nucleotide sugar transporters, critical components in the biosynthesis of plant cell walls.